Exposure to fine particles has been shown to cause severe human health impacts. In the present study, outdoor fine particles as well as elemental and organic carbon concentrations were measured in four locations within Mumbai city, India, during 2007-2008. The average outdoor PM(2.5) mass concentrations at control, kerb, residential and industrial sites were 69 ± 21, 84 ± 32, 89 ± 34, 95 ± 36 μg/m(3). In addition, fine particle PAHs were measured during the post monsoon season. The sum of PAHs in PM(2.5) at same above four sites were 35.27 ± 2.10, 42.96 ± 2.49, 175.76 ± 8.95 and 90.78 ± 4.74 ng/m(3), respectively. Estimating the carcinogenic potential of PAHs with equivalents of Benzo(a)pyrene (BaPE). The maximum value of BaPE (18.8) was reported in the residential site. A trend of lung cancer cases in Mumbai city is also presented. This was a preliminary study in understanding the health effects of PAHs in Mumbai city.